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d1vious
92 lines
2.9 KiB
Markdown
92 lines
2.9 KiB
Markdown
---
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title: "Supernova Webshell"
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excerpt: "Web Shell"
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categories:
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- Web
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last_modified_at: 2021-01-06
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toc: true
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toc_label: ""
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tags:
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- Web Shell
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- Persistence
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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- Web
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---
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### ⚠️ WARNING THIS IS A EXPERIMENTAL DETECTION
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We have not been able to test, simulate, or build datasets for this detection. Use at your own risk. This analytic is **NOT** supported.
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[Try in Splunk Security Cloud](https://www.splunk.com/en_us/cyber-security.html){: .btn .btn--success}
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#### Description
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This search aims to detect the Supernova webshell used in the SUNBURST attack.
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- **Type**: TTP
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- **Product**: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
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- **Datamodel**: [Web](https://docs.splunk.com/Documentation/CIM/latest/User/Web)
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- **Last Updated**: 2021-01-06
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- **Author**: John Stoner, Splunk
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- **ID**: 2ec08a09-9ff1-4dac-b59f-1efd57972ec1
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#### [ATT&CK](https://attack.mitre.org/)
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| ID | Technique | Tactic |
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| ----------- | ----------- |--------------- |
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| [T1505.003](https://attack.mitre.org/techniques/T1505/003/) | Web Shell | Persistence |
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#### Search
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```
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| tstats `security_content_summariesonly` count from datamodel=Web.Web where web.url=*logoimagehandler.ashx*codes* OR Web.url=*logoimagehandler.ashx*clazz* OR Web.url=*logoimagehandler.ashx*method* OR Web.url=*logoimagehandler.ashx*args* by Web.src Web.dest Web.url Web.vendor_product Web.user Web.http_user_agent _time span=1s
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| `supernova_webshell_filter`
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```
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#### Associated Analytic Story
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* [NOBELIUM Group](/stories/nobelium_group)
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#### How To Implement
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To successfully implement this search, you need to be monitoring web traffic to your Solarwinds Orion. The logs should be ingested into splunk and populating/mapped to the Web data model.
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#### Required field
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* _time
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* Web.url
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* Web.src
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* Web.dest
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* Web.vendor_product
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* Web.user
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* Web.http_user_agent
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#### Kill Chain Phase
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* Exfiltration
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#### Known False Positives
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There might be false positives associted with this detection since items like args as a web argument is pretty generic.
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#### Reference
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* [https://www.splunk.com/en_us/blog/security/detecting-supernova-malware-solarwinds-continued.html](https://www.splunk.com/en_us/blog/security/detecting-supernova-malware-solarwinds-continued.html)
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* [https://www.guidepointsecurity.com/supernova-solarwinds-net-webshell-analysis/](https://www.guidepointsecurity.com/supernova-solarwinds-net-webshell-analysis/)
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#### Test Dataset
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Replay any dataset to Splunk Enterprise by using our [`replay.py`](https://github.com/splunk/attack_data#using-replaypy) tool or the [UI](https://github.com/splunk/attack_data#using-ui).
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Alternatively you can replay a dataset into a [Splunk Attack Range](https://github.com/splunk/attack_range#replay-dumps-into-attack-range-splunk-server)
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[*source*](https://github.com/splunk/security_content/tree/develop/detections/experimental/web/supernova_webshell.yml) \| *version*: **1** |